Digital Phase-Shifting for Multiphase Converters

Multiphase converters are becoming especially important among switching power converters. This is due to their advantages, such as higher current capability, improved dynamic response or reduced EMI and harmonics, which compensate for their increased components count. Some of the key applications for multiphase converters are Voltage Regulation Modules (VRM), Dynamic Voltage Scaling (DVS) or automotive power supplies. As a drawback, multiphase controllers become more complex than their one-phase counterparts. However, digital controllers easily solve the new problems, such as multiple driving signals generation, current sharing among phases or phase-shifting. This work especially focuses on this last problem, proposing and comparing two different hardware structures for phase-shifting.